Chair frame



FIG. 1 is a side elevational view of a chair frame showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof; and

FIG. 6 is a front perspective view thereof.

The broken lines shown in FIG. 6 are for illustrative purposes only. 

The ornamental design for a chair frame, as shown and described. 